Residential Construction Academy: House Wiring (MindTap Course List)
4th Edition
ISBN: 9781285852225
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Chapter 4, Problem 13RQ
To determine
The unit in which the megohmmeter measures high value of resistance.
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PROBLEM 4
For the figure shown, determine the stresses of the wires and the elongation
when the temperature change is 45°.
Aluminum
800 mm2
Steel
600 mm2
200GPA
11.7 micro m/m°C
Area
E
70GPA
Coefficient of Linear
23 micro m/mC
Expansion
stel
AL
zm
Im
20 kym
The aluminum tube AB of cross section has a fixed support on the base and is supported by a pin at the top of a horizontal beam supporting a load Q = 200 kN. Determine the required thickness t of the tube if its outside diameter for 100 mm and the necessary safety factor in relation to Euler buckling for n = 3.0 (assuming A = 72 GPa).
I know the answer, but I cannot understand the critical charge formula. I don't know why to use the constant 2.046 in the formula, can you please show me?
11. A steel measuring tape used by a civil engineer is 50metres long and calibrated at 200C.
The tape measures a distance of 35.694m at 350C. What is the actual distance measured?
D = D LLT( )(00 a Coefficient of linear expansion of steel a = 1.2 x10-5 oC-1
Chapter 4 Solutions
Residential Construction Academy: House Wiring (MindTap Course List)
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